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gfs_numsubfiles - how many subfiles in a file.
#include <gfs.h>
int gfs_numsubfiles(int file_id);
gfs_numsubfiles returns the number of disks the file file_id
is distributed across.
gfs_numsubfiles Returns the number of subfiles in the file,
or -1 on an error.
GFS_EINVAL
file_id is not a valid file id.
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